Until the introduction of the stunning F200/F250 series, nothing else came close to achieving the speed and power-to-weight ratio of these four power and feature-packed outboards. A major contributing factor to their incredible performance is Yamaha's unique Electronic Fuel Injection (EFI) system, in which a micro-computer analyses and adjusts the fuel/air mixture to perfection under all running conditions; so starting has never been easier, acceleration never smoother, fuel economy never better, nor exhaust emissions cleaner.